Why are human breasts so large

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Breast development happens in certain stages during a woman's life: first before birth, again at puberty, and later during the childbearing years. This starts with a thickening in the chest area called the mammary ridge or milk line. By the time a baby girl is born, nipples and the beginnings of the milk-duct system have formed.

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More than 5, mammalian species inhabit Earth, yet humans are the only life form with large-sized, permanent boobies. Why is that, though? Every other mammal sprouts temporary breasts during nursing and ovulation.

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There are 1. Of them, there are 5, types of mammal. All mammals are warm-blooded and have a four-chambered heart, but so do birds.

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Breasts come in different shapes and sizes, but there's one thing they all have in common: They are unique to humans. More than 5, mammalian species inhabit this planet. Yet Homo sapiens are the only life forms with permanent breasts.

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When abnormally large breasts develop in males, it is called gynecomastia. It is due to the excess growth of breast tissue, not excess fat tissue. The condition may occur in one or both breasts.

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It has been suggested human female breast size may act as signal of fat reserves, which in turn indicates access to resources. Based on this perspective, two studies were conducted to test the hypothesis that men experiencing relative resource insecurity should perceive larger breast size as more physically attractive than men experiencing resource security. In Study 1, men from three sites in Malaysia varying in relative socioeconomic status high to low rated a series of animated figures varying in breast size for physical attractiveness.

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In my childhood, I adopted a puppy that changed my life and attitude towards animals—I have since become a lifelong animal lover. But before you get to thinking any deeper — we're coming out clean. That is a trick question, because by breasts we're actually referring to the mammary glands.

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Breasts come in different shapes and sizes, but there's one thing they all have in common: They are unique to humans. More than 5, mammalian species inhabit this planet. Yet Homo sapiens are the only life forms with permanent breasts.

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Even Darwin found it a very difficult problem: how could the evolution of breasts that give milk to the new-born have come about? He wrote: "If it could be demonstrated that any complex organ existed, which could not have been formed by numerous, successive, slight, modifications, my theory would absolutely break down. One important piece of evidence is the platypus, a monotreme mammal that has a patch on its breast that secretes milk for its infants to suck.

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Breasts are getting bigger and arriving earlier. They're also attracting chemicals and environmental toxins, which are getting passed along in breast milk. When writer Florence Williams was nursing her second child, she read a research study about toxins found in human breast milk. She decided to test her own breast milk and shipped a sample to a lab in Germany.

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